[402d]
and filtered (ἠθούμενον) represents a spring, and the name Tethys is compounded of those two words.
Hermogenes
That is very neat, Socrates.
Socrates
Of course it is. But what comes next? Zeus we discussed before.
Hermogenes
Yes.
Socrates
Let us, then, speak of his brothers, Poseidon and Pluto, including also the other name of the latter.
Hermogenes
By all means.
Socrates
I think Poseidon's name was given by him who first applied it,